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⑤do(第三人称单数){#blank#}5{#/blank#}

    What is the sky? How high is it? What color is it? What birds can live above it? These questions are difficult to answer, aren't they? In fact, the sky has no color. Then why does the sky look blue?

    We know that there is air around the world. When planes fly, they need air to lift their wings. Planes can't fly very high. That is because the air gets thinner when they go higher. The same will happen to us if we go high enough. If we go up about 1,200 kilometers from the earth, we'll find no air there. Some birds can fly into the sky as high as a plane, but they cannot fly or live without air.

    Looking up above us, you will see the blue sky with white clouds. It is usually light blue. The color would be bluer when you see on the top of a high mountain. And you will see fewer clouds in the sky between you and the sun. Sometimes the sky doesn't look blue. When the sun rises and falls, you will see red, orange and other colors in the sky, such are the most beautiful moments of the day.

    Who can see the colors of the sky high above the earth? The astronauts! They can see those beautiful colors of the sky from the outer space. However, before flying into the outer space, they sit in a spaceship high above the earth and there is no air at all. The sky would be that dark and its color would be black.

    Now you may understand that we see colors because the air scatters (使散射) the sunlight. Light travels through the air. Without air there would be no colors.

China is known as the birthplace of tea,and it has a long history of growing and enjoying this magical plant. 

One famous type of tea is Pu'er,from Yunnan Province. There are two kinds of Pu'er teas: raw and ripe. Raw Pu'er is bitter at the beginning but gets better with age,while ripe Pu'er is made in a special way that gives it a rich flavor(味道). Pu'er tea has been traded since the Tang Dynasty, and it became very popular during the Qing Dynasty. 

Another special tea is Enshi Yulu,a green tea shaped like pine needles,only produced in Enshi City, Hubei Province. This tea has a lovely green color and a delicious,smooth taste. It has been around since the Tang Dynasty and is still enjoyed today for its health benefits. 

Jasmine tea is popular in Fujian Province. It has a lovely floral aroma(花香). The tea was first created during the Song Dynasty and became a favorite of the royal family during the Ming and Qing Dynasties. 

Longjing tea, a famous green tea from Hangzhou,is known for its appearance,aroma,and taste. It has been prized since the Tang Dynasty and was even offered as a gift to the emperor during the Qing Dynasty. White Peony tea,a type of white tea from Fujian province,is another example of China's rich tea culture. It is valued for its health benefits and pleasant flavor

Tea has been used in China for thousands of years. As trade along the Silk Road grew,tea spread all over the world,becoming an important part of many cultures. So,on this World Tea Day, May 21*, let's enjoy the beauty and importance of tea,and the role it has played in shaping our world. 

Running is good for you.

 Every day in newspapers and magazines there are articles telling us we should exercise more. And scientists now say that running is one of the best ways to keep fit. {#blank#}1{#/blank#} Some say it can even make you live longer. 

Get started!

{#blank#}2{#/blank#} You don't need to buy special clothes but you should get a good pair of trainers. And remember - you should always buy trainers for running one size larger than your usual shoes. 

Make each day different!

 Some people find running boring, so go cycling or swimming instead sometimes. {#blank#}3{#/blank#} It's very important to rest two or three times a week. You should eat well and drink lots of water but you can still have nice things like chocolate sometimes. Do some leg and stomach exercises, because this helps you run better. 

Enter a race!

 If you're a beginner, there are lots of ways to make exercise fun. You can join a group or you can exercise with a friend. Another idea is to enter a race. {#blank#}4{#/blank#}

What else can you do to make exercise fun? {#blank#}5{#/blank#}